Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (2): 212-216.DOI: 10.12068/j.issn.1005-3026.2020.02.011

• Materials & Metallurgy • Previous Articles     Next Articles

Experimental Study on Granulation of Blast Furnace Slag by Gas Quenching

KANG Yue1, LIU Chao2, ZHANG Yu-zhu1,2, JIANG Mao-fa1   

  1. 1. School of Metallurgy, Northeastern University, Shenyang 110819, China; 2. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063009, China.
  • Received:2019-07-25 Revised:2019-07-25 Online:2020-02-15 Published:2020-03-06
  • Contact: LIU Chao
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Abstract: To effectively utilize waste heat from blast furnace slag(BFS)and increase the additional value of slag, the BFS is granulated using the dry treatment(gas quenching) method. The effects of basicity and nozzle pressure on bead formation rate, mean diameter and particle size distribution of slag beads are studied. The results show that with the increases of basicity, the bead formation rate firstly increases up to the highest rate at the basicity of 1.2 and then decreases. The mean diameter firstly decreases and then increases with the basicity, especially, when the basicity is over 1.2. With the nozzle pressure increasing, the bead formation rate firstly increases, followed by a drop and then raise again. The bead formation rate reaches the highest value at the pressure of 0.2MPa. The mean diameter of the slag beads decreases gradually and the decreasing tendency slows down when the pressure is larger than 0.3MPa. The particle size distribution of slag beads mainly ranges in 1~2.5mm, satisfying the Gaussian distribution basically.

Key words: gas quenching, blast furnace slag, basicity, nozzle pressure, bead formation rate, mean diameter

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